CalculynQuick answer
Rolling a 4 on a die: 1 in 6 = 16.7%. In 3 rolls, the chance of at least one 4 is 1 − (5/6)³ ≈ 42.1%.
How it works
Probability is favorable outcomes divided by total outcomes. For repeated independent attempts, the chance of at least one success is 1 − (1 − p)^n.
Formula
P = favorable ÷ total · P(at least once in n) = 1 − (1−p)ⁿ
Assumptions & limitations
- Results are rounded for display.
Frequently asked questions
Does each attempt change the odds?
Only if outcomes aren't replaced (like drawing cards without putting them back). This calculator assumes independent attempts.